Polyisocyanurate Syntactic Coating for Deep Sea Pipelines
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Solution Overview
Problem
Current thermal insulating coatings for offshore applications, particularly deep sea oil pipelines, face challenges with high thermal conductivity, insufficient mechanical properties, and increased floating behavior due to low density, which are exacerbated by high temperatures and pressures.
Innovation Solution
A polyisocyanurate-based syntactic coating is developed by reacting a polyisocyanate compound with a compound containing isocyanate-reactive hydrogen atoms in the presence of a trimerization catalyst and hollow objects, with an isocyanate index of at least 2000, using hollow glass beads to reduce thermal conductivity and enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If syntactic coatings with hollow glass beads are used to reduce thermal conductivity, then thermal insulation performance is improved, but mechanical properties become insufficient
Solution Approach 1:
The patent uses a composite material system combining polyisocyanate compound, compound with isocyanate-reactive hydrogen atoms, and hollow glass beads. This composite approach allows the coating to simultaneously achieve low thermal conductivity (0.10 W/mK) through the hollow beads and adequate mechanical properties through the polyisocyanurate polymer matrix, resolving the contradiction between thermal insulation and mechanical strength.
2Loss of energy
If syntactic coatings with hollow objects are used to reduce density, then thermal insulation is improved, but floating behavior increases
Solution Approach 1:
The patent optimizes the isocyanate index parameter to at least 2000, which changes the chemical composition and crosslinking density of the polyisocyanurate coating. This parameter change increases the coating density while maintaining the thermal insulation properties provided by hollow glass beads, thereby reducing floating behavior in submarine applications.
3Ease of manufacture
If conventional coatings are used at elevated temperatures, then ease of manufacture is maintained, but mechanical properties become insufficient at 200°C
Solution Approach 1:
The patent employs a trimerisation catalyst to change the chemical reaction pathway, forming polyisocyanurate structures with superior thermal stability. This catalytic approach maintains ease of manufacture through standard coating processes while achieving mechanical property stability up to 200°C through the enhanced polymer chemistry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating achieves a high density, low water uptake, and improved mechanical properties, including a thermal conductivity as low as 0.10 W/mK and a Young's modulus that maintains stability up to 200°C, making it suitable for deep sea applications.
Implementation Method 1
reacting a polyisocyanate compound with a compound containing isocyanate-reactive hydrogen atoms in the presence of a trimerisation catalyst
Implementation Method 2
using hollow glass beads to reduce thermal conductivity
Data Source
AI summary
A polyisocyanurate-based coating for offshore applications is provided. The coating is a syntactic coating, obtainable by reacting a polyisocyanate compound with a compound containing isocyanate-reactive hydrogen atoms in the presence of a trimerisation catalyst and hollow objects, at an isocyanate index of at least and preferably more than 2000.